Friction set for railway braking system

Abstract

Disclosed is a friction set for a railway disk brake system for railway rolling stock including: a shoe holder including a receiving slideway; a friction shoe including a brake pad and a profiled shape configured for being slid into the receiving slideway, where the friction shoe includes a pneumatic conduit connecting a first space delimited by a first surface of the friction shoe to a second space delimited by a second opposite surface the friction shoe; at least one through hole arranged in the shoe holder and laid out so as to be facing the pneumatic conduit; and a pneumatic junction ring laid out in the pneumatic conduit forming a pneumatic guide between the through hole of the shoe holder and the pneumatic conduit of the friction shoe.

The invention claimed is: 
     
       1. A friction set ( 16 ) for a railway disk brake system ( 12 ) for railway rolling stock ( 10 ) with one or two directions of movement (S 1 , S 2 ) is provided where said friction set ( 16 ) comprises:
 a shoe holder ( 3 ) comprising a receiving slideway ( 4 ); 
 a friction shoe ( 22 ) comprising a brake pad ( 7 ) and a profiled shape ( 6 ) configured for being slid into the receiving slideway ( 4 ), where the friction shoe ( 22 ) comprises a pneumatic conduit ( 9 ) connecting a first space (E 1 ) delimited by a first surface ( 71 ) of the friction shoe ( 22 ) to a second space (E 2 ) delimited by a second opposite surface ( 72 ) of the friction shoe ( 22 ); 
 at least one through hole ( 38 ) arranged in the shoe holder ( 3 ) and laid out so as to be facing the pneumatic conduit ( 9 ); and 
 a pneumatic junction ring ( 8 ) laid out in the pneumatic conduit ( 9 ) forming a pneumatic guide between the through hole ( 38 ) of the shoe holder ( 3 ) and the pneumatic conduit ( 9 ) of the friction shoe ( 22 ), 
 wherein the pneumatic junction ring ( 8 ) comprises a flange ( 81 ) resting on a bottom of the receiving slideway ( 4 ). 
 
     
     
       2. The friction set ( 16 ) according to  claim 1 , wherein a portion of the junction ring has a conical shape ( 82 ) and has a height equivalent to a height of the profiled shape ( 6 ). 
     
     
       3. The friction set ( 16 ) according to  claim 2 , wherein the receiving slideway ( 4 ) of the shoe holder ( 3 ) is blind, specifically with one closed end ( 41 ) and one open end ( 40 ) forming an opening for the extraction and insertion of the friction shoe ( 22 ), where the friction set further comprises a removable member for locking ( 19 ) the friction shoe ( 22 ) in the receiving slideway ( 4 ). 
     
     
       4. The friction set ( 16 ) according to  claim 2 , wherein the friction shoe ( 22 ) comprises a first member ( 1 ) and a second member ( 2 ) configured for being slid in the receiving slideway ( 4 ) until contact of each other in an area of butting of the first ( 1 ) and second ( 2 ) members while leaving a passage therebetween so as to form the pneumatic conduit ( 9 ). 
     
     
       5. The friction set ( 16 ) according to  claim 1 , wherein the receiving slideway ( 4 ) of the shoe holder ( 3 ) is blind, specifically with one closed end ( 41 ) and one open end ( 40 ) forming an opening for the extraction and insertion of the friction shoe ( 22 ), where the friction set further comprises a removable member for locking ( 19 ) the friction shoe ( 22 ) in the receiving slideway ( 4 ). 
     
     
       6. The friction set ( 16 ) according to  claim 5 , wherein the friction shoe ( 22 ) comprises a first member ( 1 ) and a second member ( 2 ) configured for being slid in the receiving slideway ( 4 ) until contact of each other in an area of butting of the first ( 1 ) and second ( 2 ) members while leaving a passage therebetween so as to form the pneumatic conduit ( 9 ). 
     
     
       7. The friction set ( 16 ) according to  claim 1 , wherein the friction shoe ( 22 ) comprises a first member ( 1 ) and a second member ( 2 ) configured for being slid in the receiving slideway ( 4 ) until contact of each other in an area of butting of the first ( 1 ) and second ( 2 ) members while leaving a passage therebetween so as to form the pneumatic conduit ( 9 ). 
     
     
       8. The friction set ( 16 ) according to  claim 7 , wherein the first ( 1 ) and second ( 2 ) members each form one half of the friction shoe ( 22 ). 
     
     
       9. The friction set ( 16 ) according to  claim 7 , wherein the first ( 1 ) and second ( 2 ) members are juxtaposed in a direction tangential (T) to a braking disk (DK) of the railway rolling stock ( 10 ). 
     
     
       10. The friction set ( 16 ) according to  claim 7 , wherein the passage left at the interface of the first ( 1 ) and second ( 2 ) members is arranged in an intermediate part of the butting area. 
     
     
       11. The friction set ( 16 ) according to  claim 7 , wherein the butting area is substantially defined as a butting plane (P), the first ( 1 ) and second ( 2 ) members have similar lengths in a longitudinal direction (Z 2 ) of the shoe holder ( 3 ), and the through hole ( 38 ) has a center defining an axis (A 8 ) coincident with the butting plane (P). 
     
     
       12. A railway disk brake system ( 12 ) for railway rolling stock ( 10 ) with one or two directions of movement (S 1 , S 2 ) comprising a disk (DK) secured to an axle ( 14 ) or a wheel ( 18 ) and two friction sets ( 16 ) according to  claim 1  arranged on either side of the disk (DK). 
     
     
       13. The friction set ( 16 ) according to  claim 1 , wherein the pneumatic junction ring ( 8 ) comprises a portion which has a conical shape ( 82 ). 
     
     
       14. The friction set ( 16 ) according to  claim 13 , wherein the portion has the conical shape ( 82 ) and has a height equivalent to a height of the profiled shape ( 6 ).